# Cis Cassandra40 V100 5.1

> Inter-node Encryption

- Skill: `cyberstrikeus/cis-cassandra40-v100-5-1` (Agent Skill)
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- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-cassandra40-v100-5-1

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# 5.1 Inter-node Encryption

## Profile Applicability

- Level 1 - Cassandra on Linux

## Description

Cassandra offers the option to encrypt data in transit between nodes on the cluster. By default, inter-node encryption is turned off.

## Rationale

Data being transferred on the wire should be encrypted to avoid network snooping, whether legitimate or not.

## Audit

Run the following command to verify whether inter-node encryption is enabled.

```bash
cat cassandra.yaml | grep -in "internode_encryption:"
```

Acceptable values are `all`, `dc` or `rack`. If the `internode_encryption` is set to `none`, this is a finding.
Note: The Cassandra configuration files can be found in the conf directory of tarballs. For packages, the configuration files will be located in /etc/cassandra.

## Remediation

The inter-node encryption should be implemented before anyone accesses the Cassandra server.
To enable the inter-node encryption mechanism:

1. Stop the Cassandra database.
2. If not done so already, build out your keystore and truststore.
3. Modify cassandra.yaml file to modify/add entry for internode_encryption: set it to `all`
4. Start the Cassandra database.

## Default Value

```
internode_encryption: none
```

## References

1. http://cassandra.apache.org/doc/latest/operating/security.html

## CIS Controls

- **v8 3.10** Encrypt Sensitive Data in Transit
  - Encrypt sensitive data in transit. Example implementations can include: Transport Layer Security (TLS) and Open Secure Shell (OpenSSH).
- **v7 14.4** Encrypt All Sensitive Information in Transit
  - Encrypt all sensitive information in transit.

## Profile

- Level 1 - Cassandra on Linux | Automated